chore(style): codebase em-dash sweep + minor layout polish

Replaces every em-dash and en-dash with regular ASCII hyphens
across comments, JSX strings, and dev-facing logs. Mostly cosmetic
but stops the inconsistent mix that crept in over the last few
months (some files used em-dashes in comments, others didn't,
some used both).

Bundles two small dashboard-layout tweaks that touch a couple of
already-modified files:
- (dashboard)/layout.tsx main padding goes from p-6 to pt-3 px-6
  pb-6 so page content sits closer to the topbar.
- Sidebar now receives the ports list it needs for the footer
  port switcher.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/clients/dedup-suggestion-panel.tsx

@@ -63,7 +63,7 @@ export function DedupSuggestionPanel({
   useEffect(() => {
     const t = setTimeout(() => {
       setDebounced({ email: email ?? '', phone: phone ?? '', name: name ?? '' });
-      // Clear the dismissed flag when inputs change — the user typed
+      // Clear the dismissed flag when inputs change - the user typed
       // something new, so the prior dismissal no longer applies.
       setDismissed(false);
     }, 300);
@@ -83,7 +83,7 @@ export function DedupSuggestionPanel({
       return apiFetch<{ data: MatchData[] }>(`/api/v1/clients/match-candidates?${params}`);
     },
     enabled: hasSomething && !dismissed,
-    // Same query is fine to cache for a minute — moves are slow at this layer.
+    // Same query is fine to cache for a minute - moves are slow at this layer.
     staleTime: 60_000,
   });
 
@@ -120,7 +120,7 @@ export function DedupSuggestionPanel({
           <p className="text-sm font-semibold leading-tight">
             {isHigh
               ? 'This looks like an existing client'
-              : 'Possible match — check before creating'}
+              : 'Possible match - check before creating'}
           </p>
           <div className="mt-2 rounded-md border bg-background/80 p-2.5">
             <div className="flex items-center gap-2">